| 摘要 |
PROBLEM TO BE SOLVED: To provide a blood plasma or blood serum separation filter including an ultra-thin fiber assembly and having excellent performance in which blood plasma or blood serum can be easily, speedily, and safety separated at a similar thickness to that in total blood from a small quantity of blood without damaging hemocyte components in blood. SOLUTION: An ultra-thin fiber assembly 3 is installed in a container 4 having an entrance 1 and an exit 2, blood is moved in by pressure difference between the entrance 1 and the exit 2 in the ultra-thin fiber assembly 3, and blood plasma or serum is separated from hemocyte by use of moving speed difference to be sampled between the plasma or serum and the hemocyte in the ultra-thin fiber assembly. In this case, the ultra-thin fiber assembly 3 comprises nonwoven fabric comprising ultra-thin fibers of an average fiber diameter of 0.5-3.5μm, and an average hydraulic radius of 0.5-3.0μm, or a plurality of sheets of the nonwoven fabric, a thickness of a hemocyte separating layer is 5mm or more, and a flow direction of blood is horizontal to the surface of the nonwoven fabric.
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